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Thanks for the excellent photo's!

Well, to be honest, I only used the key of Collin, since it was the only key I had. I received some other keys yesterday. I will study them in the weekend.
As said in an earlier message I paid mainly attention to the 2nd tibiae, the scutellum, the colour of the antennae.
I will certainly look for the other species! I collect them rarely myself, but I see them fairly often in material from Malaise traps.

have a nice weekend,

Ruud